Disc shaped throwing object holding a module

ABSTRACT

A disc shaped throwing object comprises a soft disc having a central section, a bridging section and a rim, where the central section forms a disc centre through which a central axis is defined and which central section is joined to the rim via the bridging section. The disc further comprises a holding structure placed radially around the central axis, the holding structure being joined with and stretching out in a direction away from an inner surface of the central section. The holding structure is adapted to hold a module with electrically powered elements in abutment with the inner surface.

TECHNICAL FIELD

The invention relates to a disc shaped throwing object.

BACKGROUND Disc shaped throwing objects such as Frisbees™ are popular to use for recreational purposes.

There exist a variety of such disc shaped throwing objects of which one is shown in CN 2649139 Y. Here the thickness of the disc from a central part to an arc-shaped edge or rim gradually changes from small to large. The disc is soft and has good safety as well as flight performance.

In some cases it is of interest to provide the throwing object with effects such as sounds and lights. In order to do this, electrically powered elements such as diodes and speakers may be added. In order to operate these also a power source such as a battery is required.

CN106166390 discloses a disc where such elements have been added.

However, it is problematic to attach such elements to a soft disc. It is for instance unsuitable to use screws. It is additionally important that the flight performance should remain as unaffected as possible.

SUMMARY

The present invention addresses the problem of safely attaching electrically powered elements to a soft disc while retaining good aerodynamic properties.

One aspect of the invention is concerned with a disc shaped throwing object comprising a soft disc having a central section, a bridging section and a rim, where the central section forms a disc centre through which a central axis is defined and which central section is joined to the rim via the bridging section. The disc further comprises a holding structure placed radially around the central axis, which holding structure is joined with and stretches out in a direction along the axis away from an inner surface of the central section and is adapted to hold a module in abutment with the inner surface, which module is a module with electrically operated elements, such as light sources and speakers.

The module may be removable, such that it can get attached, detached and reattached to the disc. This may be of interest if the attachment is not permanent.

The disc may have a Shore D hardness of 40-90 and preferably of 50-70. The material of the disc may be an elastomer, such as silicone, rubber, a thermoplastic elastomer or a thermoplastic rubber.

The holding structure may be shaped as a flexible wall projecting out from the inner surface along the axis at a radial distance from the axis and encircling a holding area where the module is to be held. The disc centre may have a first thickness at the central axis. The wall may have a second thickness that is 8-16 times higher, with advantage 10 times higher than the first thickness. The first thickness at the disc centre point may as an example be in the range of 0.3-0.5 mm, preferably 0.44 mm, while the wall may have a thickness in the range of 4.0-4.6 mm, preferably of 4.3 mm.

The shape of the holding structure may be adapted to the shape of the module, where the wall may have a diameter that diminishes in the direction away from the inner surface of the central section.

The wall of the holding structure may stretch in a range of 5.2-5.6 mm, preferably 5.4 mm from an interface between the central and bridging sections towards the central axis and may be dimensioned for holding the module having a weight in the range 4.2-4.8 g, and preferably weighing 4.5 g.

The throwing object may also comprise the module that may thus weigh in the range 4.0-5.0 g, and preferably weigh 4.5 g. The module may, as was described, be removable. The module may additionally have a diameter of 29-35 mm, preferably of 32 mm. The module may also have an actuator, for instance in the form of a button, that may rest on or against the inner surface of the central section when the module is held by the holding structure.

The thickness of the bridging section may also decrease from the rim towards the central section.

Furthermore, the rim may comprise an inner surface radially displaced from the central axis and a sequence of curved contour sections. The inner surface of the rim may at one end be joined to an inner surface of the bridging section and at a second end to an outer surface of the bridging section via the contour sections, where the contour sections interconnect the inner surface of the rim with the outer surface of the bridging section via a first extreme radius placed at a maximum horizontal distance from the inner surface of the rim. The inner surface of the bridging section may have a first curvature and a last contour section in the sequence together with at least a part of the outer surface of the bridging section may have a second, different curvature. The curvatures may cause the thickness of the bridging section to decrease towards the central axis.

The first curvature may be an exponential curvature starting from a starting radius on the inner surface of the rim and the second curvature may be a parabolic curvature starting from the first extreme radius.

It is in this case furthermore possible that the first curvature is formed as an exponential curve so that radial position changes on the first curvature starting from the starting radius on the inner surface of the rim are exponential for changes along the central axis in a direction towards an outer surface of the disc centre and that the second curvature is formed as a second degree polynomial curve, so that radial position changes on the second curvature starting from the first extreme radius are parabolic in the direction along the central axis towards the outer surface of the disc centre.

It is in the above-mentioned case also possible that the starting radius on the inner surface of the rim is axially aligned with the first extreme radius.

According to another variation it is possible that the rim comprises a second extreme radius placed at a maximum distance along the central axis from the outer surface of the disc centre.

The second extreme radius is thus no radius that is closest to or furthest away from the central axis, but a radius of the object that is axially furthest away from the outer surface of the disc centre.

It is possible that the first extreme radius is placed closer to an axially highest radius of the rim than it is to the second extreme radius, where the axially highest radius of the rim may be the rim radius that is axially closest to the outer surface of the disc centre.

It is additionally possible that the second extreme radius is radially closer to the inner surface of the rim than it is to the first extreme radius.

The contour sections may comprise a first curved contour section stretching from the inner surface of the rim to the second extreme radius, a second curved contour section stretching from the second extreme radius to an intermediate radius between the inner surface of the rim and the first extreme radius, a third curved contour section stretching from the intermediate radius to the first extreme radius and a fourth curved contour section that is the last curved contour section of the sequence.

In this case it is additionally possible that the first and second curved contour sections are parabolic starting from the second extreme radius so that axial position changes on these curvatures starting from the second extreme radius are parabolic for radial changes away from the second extreme radius. It is also possible that the third and fourth curved contour sections are parabolic starting from the first extreme radius so that radial position changes on these curvatures starting from the first extreme radius are parabolic for axial changes away from the first extreme radius. The curvatures of the first, second, third and fourth curved contour sections may for instance be curvatures with shapes as second-degree polynomial curves.

The rim may thereby also have an essentially ear shaped cross-section.

It is furthermore possible that the curvature of the second curved contour section gradually transitions into the curvature of the third curved contour section around the intermediate radius.

According to another possible variation, the curvature of the second contour section is the same as the curvature of the first curved contour section in the vicinity of the second extreme radius and the curvature of the third contour section is the same as the curvature of the fourth contour section in the vicinity of the first extreme radius.

The central section may additionally have a first radius in relation to the central axis. It is additionally possible that the central section has a uniform thickness.

In this case it is possible that the diameter of the object is at least 10 times bigger than the radius of the central section, and with advantage in the range 20-30 times bigger.

It is additionally or instead possible that the bridging section has an inner radius coinciding with the radius of the central section at which it is joined to the central section and an outer radius at which it is joined to the rim, wherein the outer radius is in the range 8-14 times the inner radius.

Another possibility is that the width of the rim in the radial direction, i.e.

between first extreme radius and the inner surface of the rim, is in the range 4-8 mm.

Yet another possibility is that the object has a thickness in the range of 10-14 mm. This thickness may be the thickness at the centre point when also the rim is considered.

The disc may additionally have a weight that is in the range 45-55 g and preferably 48.8 g. Thereby the disc may be significantly heavier than the module. The disc may be in the range 9-14 and with advantage about 11 times heavier than the module.

The invention has a number of advantages. It allows the simultaneous reaching of several different objectives. It allows a module with electrically powered element to be used with the soft disc. Thereby the user experience of the throwing object may be enhanced. In use, the module is safely held to the disc. This is also achieved with a minimal influence by the module on the flying ability of the throwing object.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to “a/an/the element, apparatus, component, means, step, etc.” are to be interpreted openly as referring to at least one instance of the element, apparatus, component, means, step, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is now described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 shows a perspective view from above of a disc shaped throwing object,

FIG. 2 shows a perspective view from below of the disc shaped throwing object comprising a disc with a holding structure holding a module,

FIG. 3 shows a top view of a disc of the throwing object with indications of where a cross-section is taken,

FIG. 4 shows a bottom view of the disc with a rim and the holding structure holding the module,

FIG. 5 shows a cross-sectional view of the disc taken at the cross-section indicated in FIG. 3 ,

FIG. 6 schematically shows a first enlargement of a part of the cross-section showing a central section of the disc together with a module to be held by the holding structure,

FIG. 7 show a perspective view from above of the module,

FIG. 8 shows a perspective view from below of the module,

FIG. 9 shows a second enlargement of a part of the cross-section showing a rim and parts of a bridging section,

FIG. 10 shows a third enlargement with further details of the rim and bridging section,

FIG. 11 a shows an exponential curve,

FIG. 11 b shows a parabolic curve, and

FIG. 12 shows the disc being folded in the hand of a user.

DETAILED DESCRIPTION

The invention will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout the description.

FIG. 1 schematically shows a perspective view from above of a disc shaped throwing object 10 that comprises a disc 11, FIG. 2 shows a perspective view from below of the disc shaped throwing object 10 comprising the disc 11 with a holding structure 18 that holds a module 20, FIG. 3 schematically shows a front view of the disc 11 together with an indication A-A of where a cross-sectional view has been taken, FIG. 4 schematically shows a bottom view of the disc that shows a rim 16 and the holding structure 18 holding the module 20, FIG. 5 shows the cross-sectional view of the disc 11 taken at the cross-section A-A indicated in FIG. 3 , FIG. 6 shows a first enlargement of a part of the cross-section showing a central section 12 with the holding structure 18 together with the module 20 that is to be held by the holding structure 18, FIG. 7 shows a perspective view from above of the module 20 and FIG. 8 shows a perspective view from below of the module 20.

As can be seen in the above-mentioned figures the throwing object 10 is disc shaped and comprises a disc 11 that is provided together with an electronic module 20 with electrically powered elements, such as light sources like light emitting diodes (LEDs) and speakers, where the module 20 may be a part of the throwing object 10 or a separate item that is attachable to the disc 11, in which latter case the throwing object 10 is only made up of the disc ii.

As can be best been in FIG. 5 , the disc ii comprises a central section 12, a bridging section 14 and a rim 16, where the central section 12 is joined to the rim 16 via the bridging section 14. The central section 12 may be considered to be a first air cushion section and the bridging section 14 may be considered to be a second air cushion section. The sections are termed this way since in use both of them are supposed to be lifted by an air cushion.

The central section 12 is cylindrical and may have a uniform thickness T1 corresponding to the height of the cylinder, that is furthermore solid. The thickness is in this case in the range of 0.3-0.5 mm, where a preferred thickness may be 0.44 mm. As the central section 12 is shaped as a cylinder, there is also defined a central axis AX through the middle, i.e. through a centre point of this central section 12, and the section has a first radius R1 in relation to the central axis AX. This centre point is also a disc centre. Thereby the central section 12 may form a disc centre through which the central axis is defined.

The central section 12 has an inner surface and an outer surface, where the inner surface is also termed a central section inner surface CSIS and the outer surface is termed a central section outer surface CSOS. The central section inner surface CSIS forms a bowl like cavity together with an inner surface of the rim 16 and an inner surface of the bridging section 14, which cavity in use is to be lifted by the previously mentioned air cushion.

It can also be seen that the bridging section 14 has an inner radius coinciding with the first radius R1 of the central section 12 and an outer radius R2 at which it is joined to the rim 16. As can be seen in the figures this bridging section 14 does not have a uniform thickness, but instead a thickness that increases towards the rim 16 or decreases towards the central section 12.

The rim 16 in turn has a cross-section shaped as an ear.

As can best be seen FIG. 6 , the central section 12 is provided with a holding structure 18 in order to hold the module 20 against the central section inner surface CSIS. The holding structure 18 is placed radially around the central axis AX and is joined with and stretches out along the axis AX in a direction away from the central section inner surface CSIS.

As can be seen in FIG. 7 , the module 20 may have a base section 22 with a first diameter, a shoulder section 24 with a second lower diameter and a main section 26 with a third lowest diameter, where the diameter of the base section 22 may be in the range 29-35 mm and with advantage 32 mm, the diameter of the shoulder section 24 may be in the range 27-32 mm and with advantage 30 mm and the diameter of the main section 26 may be in the range 23-29 mm and with advantage 27 mm. The module 20 may also have a weight in the range 45-55 g and with advantage 49 g.

The holding structure 18 is adapted to hold the module 20 in abutment with the central section inner surface CSIS, i.e. to hold the module 20 against the inner surface of the central section 12. The holding structure 18 is shaped as a flexible wall projecting out from the central section inner surface CSIS in the axial direction and encircling a holding area where the module 20 is to be held. The wall is placed at the radial distance R1 from the axis AX. The wall also has a diameter that diminishes in the direction along the axis AX away from the central section inner surface CSIS. The diameter variation may depend on the shape of the module 20. The diameter variation may as an example be a step-wise diameter reduction corresponding to the shape of the module 20. The shape of the holding structure 18 may thus be shaped after the shape of the module 20.

The holding structure may for this reason have a first radius R3 a corresponding to the first diameter of the base section 22, a second radius R3 b corresponding to the second diameter of the shoulder section 24 and a third radius R3 c corresponding to the third diameter of the main section 26. Thereby a first part of the holding structure 18, when holding the module 20, encircles the base section 22 at the first radius R3 a, a second part of the holding structure 18 encircles the shoulder section 24 at the second radius R3 b and covers and holds the base section 22 against the central section inner surface CSIS and a third part encircles the main section 26 at the third radius R3 c and covers and holds the shoulder section 24 towards the inner surface CSIS.

The thickness T2 of the wall may be in the range of 4.0-4.6 mm, preferably 4.3 mm. A wall with a diminishing diameter may furthermore have an extension in the radial direction from an interface between the central section 12 and the bridging section 14 towards the axis AX in a range of 5.2-5.6 mm and preferably 5.4 mm.

The disc 11 is typically made in one piece and it is with advantage also flexible, so that it can be folded, see FIG. 12 . It can thereby be easily stowed away and carried around, such as in a pocket. It will because of this also be soft, which is good for avoiding injuries. The material of which the disc is made may for this reason be an elastomer, such as silicone, Thermoplastic Elastomer (TPE), Thermoplastic Rubber (TPR) or rubber. It may additionally have a Shore D hardness of 40-90 preferably of 50-70.

A soft disc having the above-mentioned properties is soft and has excellent aerodynamic or air flight properties. A soft and thin object has another advantage. When this object is flying in the air, central parts around the central axis, such as the central section and parts of the bridging section, will be lifted higher by an air cushion than peripheral parts, such as the parts of the bridging section close to the rim. A bulge is thereby formed around the central axis. In this way the aerodynamic properties are further enhanced.

Through the realization of the holding structure, it is furthermore possible to effectively and safely hold the electronic module without jeopardizing the aerodynamic properties. It is thereby possible to provide the throwing object with various effects that might enhance the experience of throwing the object, such as light sources that may be blinking and speakers emitting audible sounds, with minimal negative influence on the flying capability. In order to provide such effects, the module 20 may be equipped with diodes 28 and 30, which as an example may be placed in cavities of the shoulder section 24. In order to power these elements a power source, such as a battery, may also be included. Due to the soft material holding structure realization, the module may be easily removed, which may be desirable in case the battery needs to be replaced. A replacement may also be of benefit in case different types of effects are to be combined with the disc. Some types of light sources may for instance be preferred during day time and others during night time. The module 20 may thus be removable. The user is thereby allowed to easily remove and replace the module. However, it is also possible that the module is fixedly attached to the central section 12 and/or the holding structure 18, for instance using glue. It may even be possible to change the power source of such a fixedly attached module in case this power source is easily accessible via the main module section 26.

The module 20 may also have an actuator 34, for instance in the form of a button, which may be used to turn on and off the elements of the module 20, such as to turn on and off components such as diodes. The actuator 34 may also be used for changing modes of the diodes, such as changing between permanent, pulsating and blinking lights. In the example given here, the actuator 34 is placed in the bottom 32 of the base section 22. It is thus placed in a surface of the electronic module 20 that is held against the central section inner surface CSIS of the disc ii. Thereby the actuator 34 rests on the central section inner surface CSIS when the module 20 is held by the holding structure 18. This has the advantage of allowing a user to actuate the module from the central section outer surface CSOS. The actuation can thereby be made with only a slight change of grip through for instance changing the position of the thumb. This simplifies the actuation, such as a change of mode, when a user is at the same time about to throw the object.

The electrically powered elements are not limited to LEDs and speakers, but also other types of elements may be used. It is for instance possible with sensors such as accelerometers or magnetometers.

The aerodynamic properties of the throwing object will now be described with reference being made to FIG. 9, 10, 11 a and 11 b.

FIG. 9 shows a second enlargement of a part of the cross-section in FIG. 3 showing a rim and parts of a bridging section and FIG. 10 shows a third enlargement with further details of the rim and bridging section.

As may be best seen in FIG. 10 , the rim has an inner surface RIS at a distance from the central axis AX corresponding to the second radius R2 and a sequence of curved contour sections CS1, CS2, CS3, CS4.

The inner surface RIS of the rim 16 has the same distance R2 to the central axis AX. It is thereby curved around and surrounds and faces the central axis AX. The inner surface RIS thereby surrounds a cylindrical volume with radius R2 centred around the central axis AX. Moreover, the inner surface RIS is at a first end joined to an inner surface BSIS of the bridging section 14 and at a second end is joined to an outer surface BSOS of the bridging section 14 via the contour sections CS1, CS2, CS3 and CS4 and. Thereby, the first end is also joined to a flat inner surface CSIS of the central section 12 via the inner surface BSIS of the bridging section 14 and the second end is also joined to an outer surface CSOS of the central section 12 via the contour sections CS1, CS2, CS3 and CS4 and the outer surface BSOS of the bridging section 14. The inner surface of the bridging section will in the following be termed bridging section inner surface the outer surface of the bridging section will be termed bridging section outer surface and the inner surface of the rim will be termed the rim inner surface.

Moreover, the contour sections CS1, CS2, CS3 and CS4 interconnect the rim inner surface RIS with the bridging section outer surface BSOS via a first extreme radius ER1 placed at a maximum radial distance from the rim inner surface RIS. The first extreme radius ER1 can thereby be considered to be an edge in the contour of the rim 16.

Moreover, the bridging section inner surface BSIS has a first curvature and the last contour section CS4 in the sequence of contour sections together with at least a part of the bridging section outer surface BSOS has a second, different curvature, where the combination of these curvatures cause the thickness of the bridging section 14 to decrease towards the disc centre, which in this case is also towards the central section 12. Through having two curvatures in this way it is possible to optimize different aspects of the flying object independently of each other. The first curvature may as an example be designed in order to decrease very rapidly from the rim 16 towards the central section 12 in the neighbourhood of the rim and thereafter to decrease slowly, which may be important if the weight of the throwing object 10 is to be lowered. At the same time the second curvature can be designed for other purposes, such as in order to achieve various aerodynamic goals.

One way in which two such curvatures are obtained in the figures will now be described.

One example of a first curve C1 that is an exponential curve and that may be employed for forming the first curvature is shown in FIG. 11 a . One example of a second curve C2 that is a second-degree polynomial curve that may be employed for forming the second curvature is shown in FIG. 11 b . This second curve has an extreme point EP which is a minimum.

According to the variation of the invention shown in FIG. 9-10 , the first curvature of the bridging section inner surface BSIS is formed as an exponential curve, such as the curve C1 in FIG. 11 a, so that radial position changes on the first curvature starting from a starting radius on the rim inner surface RIS are exponential for changes in the direction of the central axis AX towards the outer surface of the disc centre, which in this case is also towards the central section outer surface CSOS. This means that as the axial distance on the rim inner surface in the axial direction decreases from the starting radius SR towards the central section outer radius, the radial distance to the central axis AX decreases exponentially. The radius of the bridging section inner surface BSIS thus decreases exponentially with decreasing axial distances from the starting radius towards the central section outer radius CSOS. As can be seen in FIG. 10 , it is additionally possible that the starting radius SR is axially aligned with the first extreme radius ER1. They may thus be placed at essentially the same position along the axis AX.

The second curvature may instead be formed like a second degree polynomial curve, such as the curve C2 in FIG. 11 b , so that radial position changes on the second curvature starting from the first extreme radius ER1 are parabolic for changes in the direction along the central axis AX towards the outer surface of the disc centre, which in this case is also towards the central section outer surface CSOS. This means that as an axial distance on the surface of the last contour section CS4 and the bridging section outer surface BSOS is decreased from the first extreme radius ER1 towards the outer surface of the disc centre, which in this case is also towards the central section outer radius CSOS, the radial distance to the central axis AX decreases parabolically. The radius of the contour section CS4 and at least some parts of the bridging section outer surface BSOS thus decrease parabolically with decreasing axial distances from the first extreme radius ER1 towards the outer surface of the disc centre, which in this case is also towards the central section outer surface CSOS. The curve may thus be a parabolic curve, such as that shown in FIG. 11 b , where the first extreme radius ER1 corresponds to an extreme point EP of such a curve C2, such as a maximum or a minimum. Moreover, the radius at which the transition from the last contour section CS4 of the rim 16 to the bridging section outer surface BSOS is made is an axially highest HR radius of the rim 16. The axially highest radius HR is thus the radius of the rim 16 that is axially closest to the outer surface of the disc centre, which in this case is also the central section outer surface CSOS.

As can be seen in FIG. 10 , the rim 16 may also comprise a second extreme radius ER2. This extreme radius may be placed at a maximum distance in the direction of the central axis AX away from the outer surface of the disc centre, which in this case is also away from the central section outer surface CSOS. The radius is thus no radius that is closest to or furthest away from the central axis AX, but a radius of the object that is axially furthest away from the outer surface of the disc centre, which is here the central section outer surface CSOS.

As mentioned earlier the rim 16 comprises a sequence of contour sections. This sequence is a sequence according to which the contour sections are joined to each other. It can be seen in FIG. 10 that the sequence comprises a first curved contour section CS1, a second curved contour section CS2, a third curved contour section CS3 and a fourth curved contour section CS4, which fourth curved contour section is the last curved contour section in the sequence. Alternatively, the fourth curved contour section may be considered to be the first in the sequence and the fourth to be the last.

The first curved contour section CS1 stretches from the rim inner surface RIS to the second extreme radius ER2, the second curved contour section CS2 stretches from the second extreme radius ER2 to an intermediate radius IR between the rim inner surface RIS and the first extreme radius ER1, the third curved contour section CS3 stretches from the intermediate radius IR to the first extreme radius ER1 and the fourth curved contour section stretches from the first extreme radius ER1 to the axially highest radius HR of the rim 16.

It can here be seen that the first and second curved contour sections CS1 and CS2 have curvatures shaped as second-degree polynomial curves so that axial changes on these curvatures starting from the second extreme radius ER2 are parabolic for changes in the radial direction away from the second extreme radius ER2. The axial distance from the curved contour sections CS1 and CS2 to the axially highest radius HR thereby decrease parabolically for changes in the radial direction away from the second extreme radius ER2. The curved sections may more particularly, at least initially, be curved according to the same parabolic curve. The first and second curved contour sections CS1 and CS2 may thus be shaped according to the same second-degree polynomial curve. The curve may thus be a parabolic curve, such as that shown in FIG. 11 b , where the second extreme radius ER2 corresponds to the extreme point EP, such as a maximum or a minimum, and the first curved contour section may be shaped as a part of the curve on one side of the extreme point, while the second curved contour section may be at least partly shaped as a part of the curve on the other side of the extreme point ES.

The third and fourth curved contour sections CS3 and CS4 may likewise be formed as second-degree polynomial curves so that radial changes on these curvatures starting from the first extreme radius ES1 are parabolic for axial changes away from the first extreme radius ER1. The radial distance from the curved contour sections CS3 and CS4 to the axis AX thereby decrease parabolically for changes in the axial direction away from the first extreme radius ER1. The curved contour sections may also here, at least initially, be curved according to the same parabolic curve. The third and fourth curved contour sections CS3 and CS4 may thus be shaped according to the same second-degree polynomial curve. The curve may thus be a parabolic curve, such as that shown in FIG. 11 b , where the first extreme radius ER1 corresponds to the extreme point EP, such as a maximum or a minimum, and the third curved contour section may be at least partly shaped as a part of the curve C2 on one side of the extreme point ES, while the fourth curved contour section may be shaped as a part of the curve on the other side of the extreme point ES.

As can also be seen in FIG. 10 , the curvature of the second curved contour section CS2 may gradually transition into the curvature of the third curved contour section CS3 around the intermediate radius IR. The second curved contour section CS2 may therefore only have the same curvature as the first curved contour section CS1 in the vicinity of the second extreme radius ER2, while the third curved contour section CS3 may only have the same curvature as the fourth curved contour section CS in the vicinity of the first extreme radius ER1.

One other observation that can be made in FIG. 10 is that the first extreme radius ER1 is placed closer to the axially highest radius HR of the rim 16 than it is to the second extreme radius ES2. It can also be seen that the second extreme radius ER2 is radially closer to the rim inner surface RIS than it is to the first extreme radius ER1.

The diameter D of the disc may be at least ten times bigger than the radius R1 of the central section 12, and with advantage 20-30 times bigger. The outer radius R2 of the bridging section 14 may in turn be in the range 8-14 times bigger than the inner radius R1. The width W of the rim in the radial direction, i.e. between first extreme point ES1 and the rim inner surface RIS may be in the range 4-8 mm. The disc may finally have a thickness T3 in the range of 10-14 mm, which thickness may essentially be the thickness of the rim 14.

The disc of the throwing object realized in this way has a very thin central section 12 and a bridging section 14 that quickly becomes very thin. Thereby it is possible to make the object lightweight. This improves the ability of the object 10 to stay long in the air. Through the design of the rim 16, the object can at the same time be firmly gripped and accurately thrown. The curved contour sections of the rim also gives the object good aerodynamic properties allowing a stable flight and makes the object less inclined to wobble in the air.

The weight of the disc may be in the range 45-55 g and preferably 48.8 g. As the module may have a weight in the range 4.0-5.0 g, and preferably weigh 4.5 g, the disc is significantly heavier than the module. The disc may be in the range 9-14 and with advantage about 11 times heavier than the module. This is another reason for the impact of the module on the flying ability of the throwing object being limited.

There are a number of variations that may be made to the invention apart from those already disclosed. It is for instance possible that the central section does not have any uniform thickness but also has a thickness that diminishes towards the disc centre. It should also be realized that the use of different described curvatures on the rim and bridging section is also optional. The rim may have any type of conventional realization.

The invention has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims. 

1. A disc shaped throwing object comprising a soft disc having a central section, a bridging section and a rim, where the central section forms a disc centre through which a central axis is defined and which central section is joined to the rim via the bridging section, the disc further comprising a holding structure placed radially around the central axis, the holding structure being joined with and stretching out along the axis in a direction away from an inner surface of the central section, said holding structure being adapted to hold a module with electrically powered elements in abutment with the inner surface.
 2. The disc shaped throwing object according to claim 1, wherein the disc has a Shore D hardness of 40-90 and preferably of 50-70.
 3. The disc shaped throwing object according to claim 1, wherein the material of the disc is an elastomer, such as silicone, rubber, a thermoplastic elastomer or a thermoplastic rubber.
 4. The disc shaped throwing object according to claim 1, wherein the holding structure is shaped as a flexible wall projecting out from said inner surface along said axis at a radial distance from the axis and encircling a holding area where the module is to be held.
 5. The disc shaped throwing object according to claim 4, wherein the disc centre at the central axis has a first thickness and the wall of the holding structure has a second thickness that is 8-16 times higher, with advantage 10 times higher than the first thickness.
 6. The disc shaped throwing object according to claim 5, wherein the holding structure adapted to the shape of the module with a diameter that diminishes in the direction away from the inner surface of the central section.
 7. The disc shaped throwing object according to claim 6, wherein the module has a weight of 4.2-4.8 g, preferably 4.5 g, and a diameter of 29-35 mm, preferably 32 mm.
 8. The disc shaped throwing object according to claim 7, further comprising the module, wherein the module has an actuating button, which rests against the inner surface of the central section when the module is held by the holding structure.
 9. The disc shaped throwing object according to claim 1, wherein the thickness of the bridging section decreases from the rim towards the central section.
 10. The disc shaped throwing object according to claim 1, wherein the rim comprises an inner surface radially displaced from the central axis and a sequence of curved contour sections, where the inner surface of the rim is at one end joined to an inner surface of the bridging section and at a second end is joined to an outer surface of the bridging section via said contour sections, where the contour sections interconnect the inner surface of the rim -with the outer surface of the bridging section via a first extreme radius placed at a maximum horizontal distance from the inner surface of the rim, wherein the inner surface of the bridging section has a first curvature and a last contour section in the sequence together with at least a part of the outer surface of the second air cushion section has a second, different curvature).
 11. The disc shaped throwing object according claim 10, wherein the first curvature is an exponential curvature starting from a starting radius on the inner surface of the rim and the second curvature is parabolic curvature starting from the first extreme .
 12. The disc shaped throwing object according to claim 10, wherein, the rim comprises a second extreme radius placed at a maximum distance along the central axis from an outer surface of the disc centre.
 13. The disc shaped throwing object according to claim 12, wherein first extreme radius is placed closer to an axially highest radius of the rim than to said second extreme radius, wherein the axially highest radius of the rim is the radius that is axially closest to the outer surface the disc centre
 14. The disc shaped throwing object according to claim 12, wherein the second extreme radius radially closer to the inner surface of the rim than it is to the first extreme radius.
 15. The disc shaped throwing object according to claim 12, wherein curvature of the second curved contour section is the same as the curvature of the first curved contour section in the vicinity of the second extreme radius and the curvature of the third curved contour section is the same as the curvature of the fourth curved contour section in the vicinity of the first extreme radius. 